On the properties of magnetoacoustic surface waves

Details On the properties of magnetoacoustic surface waves On the properties of magnetoacoustic surface waves

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..119..257m&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 119, no. 2, 1989, p. 257-278.

Physics

25

Magnetoacoustic Waves, Solar Atmosphere, Surface Waves, Wave Propagation, Penumbras, Pressure Distribution, Solar Magnetic Field, Velocity Distribution

Scientific paper

The nature of magnetoacoustic surface waves at a single magnetic interface, one side of which is field-free, is explored for the case of parallel propagation. The interface may support a slow surface wave or both slow nad fast surface waves, depending upon the ordering of the sound speeds in the two media. Phase-speeds and penetration depths of the waves and the associated pressure perturbations and motions are investigated for a variety of field strengths and sound speeds. The fast wave disturbs the interface more than the slow wave. In the magnetic field region the slow wave is mainly longitudinal in nature while the fast surface wave is transverse for strong fields, longitudinal for weaker fields. In the field-free region both waves are longitudinal in character. The running penumbral wave phenomenon may provide an example of a magnetoacoustic surface mode, though any direct comparison requires the inclusion of gravitational effects.

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